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M. E. SMITH.

STEAM. GENERATOR. No. 308,388. 7 Patented Nov. 25, 1884.

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MICHAEL HOLROYD SMITH, OF HALIFAX, COUNTY OF YORK, ENGLAND.

STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 308,388, dated November 25, 1884. Application filed February 19, 1884. (N0 model.) Patented in England June 9, 1883, No.2,890.

To all whom it may concern:

Be it known that I, MICHAEL HOLROYD SMITH, a subject of Her Majesty the Queen of Great Britain, residing at Halifax, in the county of York, England, have invented a certain new and useful Improvement in Hot- WVater Boilers and Steam-Generators, of which the following is a specification.

This invention relates, principally, to vertical cylindrical boilers for heating water or generating steam, so designed as to afford great facilities for constructing or putting together of the various parts, large capacity of furnace and heating-surface, full and convenient access to the fire flue or lines for the purpose of cleaning, repairing, and replacing the same.

To clearly explain my said invention, and to show how the same may be practically carried into effect, reference is made to the aecompanying drawings, which form part of this specification, and in Which- Figure 1 represents a side sectional elevation of a vertical boiler made in accordance with my invention. Fig. 2 represents a front sectional elevationof same. Fig. 3 represents a side sectional elevation of a vertical boiler, in which a horizontal fire-flue and a bafflingplate are shown. Fig. 4 represents a front sectional elevation of a boiler with three firetubes incased by a nearlyoval water-way. Figs. 5, 6, and 7 represent, respectively, a side sectional elevation, a plan of the flues, and a back elevation in a boiler in which there are sixteen fire-tubes. Figs. 8 and 9 represent, on an enlarged scale, the details of construction by which any incrustation or scale may be readily removed.

In all the figures like letters of reference refer to corresponding parts of the apparatus.

The construction shown in Figs. 1 and 2 consists of a vertical cylindrical boiler with dometopped fire-box, having its sides forming the outer and inner shell or water-way connected by means of two concentric tubes, a a and b b, the space 0 0 between the two tubes being a water-way, the interior of the inner tube, Z) 6, forming a fire-flue. The concentric tubes to and b are placed across the furnace preferably at an angle or incline, so as to secure free circulation of the water, and also provide a convenient room underneath it for the the door (Z at one side of the boiler. The exit or apertures for the heated gases is formed near the crown of the furnace at e, and such exit and also the open end of the fire-tubef are covered and inclosed by an outer casing forming a combustion-chamber, g. The other and opposite end of the firetubefis inclosed by means of an outer smoke box, h, in connection with which is .the funnel of chimney i. The combustion-chamber g and the smoke-box h are each fire-clay-lined, as shown, and pro vided with doors j, so that when the latter are open there is a free and unobstructed Way through the fire-tube for cleaning, repairing, or replacing the tube. The course of the flame and heated gases is from the fire-grate to and around the cross tubular waterway c c,- thence to the crown e of the furnace, and by Way of the outlet k to the combustion-chamber g,- thence to and through the fire-fiuef, and to the smokebox h and funnel or chimney t, as shown by the line of arrows.

In Fig. 3 an extended course for the flame and heated gases is obtained by the use of an inclined baffler-plate, Z, placed within the furnace, the outlet is being behind the said plate, so that the flame passes upward from the grate to and around a portion of the cross water-- way tube 0 to the crown e of the fire-box,- thence downward, and so again across the other portion of the water-way tube to the back of the inclined bat'tler-plate Z, and through the outlet 7s to the combustion-chamber g,- thence to and along the fire-tubefto the smoke-box h and chimney t on the opposite side.

In lieu of the cylindrical cross water-way and one main fire -tube within the same I sometimes employ one or more cylindrical e1- liptical or other shaped cross waterway tubes or water-ways, as illustrated by Figs. 4, 5, 6, 7, and 8, and have two or more longitudinal fireflues therein; but further reference need not be made to these forms, as they will be readily understood from the previous description and from the letters of reference marked thereon.

For the purpose of removing any incrustation, scale, or sediment that may form or settle upon the outside of the fire-flues, I providesuitable hand-holes, m m, for the introduction of a scraper or other cleaning device, 0, said hand-holes and scraper being most clearly shown in Figs. 8 and 9 of the drawings.

Having thus fully described my invention dome, the chambers 7c and g, the fire-flue f, formed by the Walls of the Water-ways, and connecting the combustion-chamber g, smokeb0X h, and the chimney t, all combined and arranged to serve with the doors j and d, as set forth.

MICHAEL HOLROYD SMITH. \Vitnesses:

HENRY PARKER, Jr., J OSEPH H. PARKER, Clerks to filessrs. Holroyd Smith A; Land, Solicitors, Halifax, Yorkshire, England. 

